Kvasny Prumysl, 1991 (vol. 37), issue 12
Quantitative analysis of free dimethylsulphide and its precursors in malt and beer II. Quantitative analysis of free dimethylsulphide and its precursors in wort and beer.Peer-reviewed article
J. ČULÍK, V. KELLNER, B. ©PINAR, Z. RÖSSNEROVÁ, L. VESELÝ
Kvasny Prum. 1991; 37(12): 329-334 | DOI: 10.18832/kp1991032 
The content of free dimethylsulphide (DMS) and its precursorsin wort and beer can be determined by the method of static headspace analysis. Problems connected with the detection of DMS using flame photometric detector (FPD) can be eliminated by the right choice of the evaluation procedure. As the suitable evaluation procedure can be recommended the calibration method with an internal standard or standard addition. Both the calibration methods give comparable results as prooved experimentally. With the determination of precursors of free dimethylsulphide (PDMS) no satisfactory results have been achieved. Further, the method of free DMS determination...
Critical study of fermentor aeration capacity (k1a) measurement methods. 2. Dynamic measurement methods.Peer-reviewed article
V. LINEK, C. HOLEČEK
Kvasny Prum. 1991; 37(12): 334-341 | DOI: 10.18832/kp1991033
In the first part of the paper general causes of the k1a measurement errors were quantitatively analyzed and an analysis of the steady-state methods was presented. This part shows results of tests of mainly used dynamic methods. Measurements were tested by comparing k1a values resulting from the method tested with those found under identical conditions by a method, the reliability of which was proved in advance. Mainly used dynamic methods yield in noncoalescent systems errors of k1a values up to hundreds of per cent. In all cases tested the error was caused by incorrect assumptions in the oxygen transport model, because...